a shelled egg, with a large yolk and a number of shell membranes, which retains water and allows reptiles, birds, and egg-laying mammals to reproduce on land. Named for the amnion, the innermost shell [..]

describes plants that can keep their internal water content constant, regardless of the external environment e.g. ferns, conifers and other gymnosperms, flowering plants.

a term describing a group of taxa (e.g. species, families) which are placed in the same taxonomic group but do not all have the same common ancestor e.g. the taxon consisting of the algae is polyphyle [..]

an animal that walks on all four feet.

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